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[APD] CaCO3 vs CaCl2/NaHCO3 in non-CO2 tank

I have an 50g non-CO2 tank to which I add each week ~5ppm GH (as CaCl2 and MgSO4) and 1/2 tsp NaHCO3 to maintain the GH ~120-150ppm and KH 50-70ppm (also adding a bit of K2SO4 and some traces). Since I'm not doing any water changes, should I be concerned about sodium accumulation (the fact that my discus are still breeding indicates 'probably not'). I'm considering perhaps switching to CaCO3, although I've always been hesitant to use it in the past because CaCl2 and NaHCO3 are so much more soluble and easier to work with. But I've only been running non-CO2 for 3 months and previously I was running CO2 and doing 50% w/c 1-2x per week so wasn't really worried about accumulation at all. So should I be worried now?


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